The M48 Gas-Particulate Filter was designed by the U.S. Army as the NBC protective system of the Abrams A1M1 tank. It is a compact, lightweight, radial filter with a nominal flow of 100 CFM (2830 lt/min), constructed from aluminum alloy and coated with a special chemical resistant paint. Each M48 filter is packed in a hermetically sealed metal can ensuring a shelf-life of at least 5 years.

Shalon has designed and developed a versatile range of collective NBC filtration systems providing complete protection to occupants of communal shelters from all known NBC agents. All systems are produced to meet Israeli civil defence specifications.

The complete purification system is comprised of the following major components:
• Pre-filter: A washable and easily replaced synthetic foam for removing coarse dust particles.
• Blast valve: Protects against shock waves from nuclear or conventional detonations.
• NBC gas-particulate filter: Filters out all NBC agents in the form of vapours and aerosols.
• Fan Unit: Draws in air, and delivers it through the system and into the shelter. The fan has an electric motor but is also adapted for manual operation by one person.
• Flowmeter: Measures the air flow and permits its adjustment to the required level.
• Overpressure valve: Regulates the overpressure in the shelter to maintain a clean atmosphere.

Description The ME-4 Gas-Particulate Filter was designed and developed by Shalon Chemical Industries and the Israel Defense Forces, for the NBC protective system of the Israeli Merkava tank. It is a robust and durable high capacity filter with nominal flows of 3000-5000 LPM, constructed of strong rigid stainless steel and containing glass-fibre HEPA media complying with ASME AG-1 Section FC-1, and ASC 12x30 activated charcoal complying with MIL-C-13724D.